Follistatin is a protein that is naturally produced in the body. It is primarily known for its role in regulating the activity of a group of proteins called transforming growth factor-beta (TGF-beta) superfamily. Follistatin binds to and inhibits the actions of certain members of this superfamily, including myostatin, activin, and others.
One of the most well-known functions of follistatin is its ability to inhibit myostatin, a protein that limits muscle growth. By binding to myostatin and preventing its activity, follistatin promotes muscle growth and development.
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